184 



TRANSPORTATION OF THE GAMETES 



POSTERIOR 

 VENA CAVA 



TESTES 



ME SORC H I U M 



ILIAC VEIN 



EPIDIDYMIS 



KIDNEY 



FEMORAL 



VEIN 

 DORSAL 

 AORTA 



RENAL 



PORTA L 

 VEIN 



URETER 



VA S 

 DEFERENS 



C LOAC A 



Fig. 102. Reproductive and urinary structures of the adult Leghorn cock. Observe that 

 the vas deferens is a much convoluted structure. (After Domm: In Sex and Internal Se- 

 cretions, by Allen, et al.,, Baltimore, Williams & Wilkins, 1939.) 



each contraction of the caudal portion of the deferential duct during sperm 

 discharge serves to move the general mass of seminal fluid posteriad in a 

 gradual manner. The reproductive conditions present in the cock fulfill the 

 requirements of a continuous breeder capable of serving many individual 



